package com.mindskip.xzs.service.impl;

import com.mindskip.xzs.domain.Classes;
import com.mindskip.xzs.domain.ClassesUser;
import com.mindskip.xzs.domain.User;
import com.mindskip.xzs.domain.classes.ClassesUserInfo;
import com.mindskip.xzs.domain.other.KeyValue;
import com.mindskip.xzs.repository.ClassesMapper;
import com.mindskip.xzs.repository.ClassesUserMapper;
import com.mindskip.xzs.service.ClassesService;
import com.mindskip.xzs.service.enums.ResultEnum;
import com.mindskip.xzs.viewmodel.teacher.classes.ClassesPageRequestVM;
import com.mindskip.xzs.viewmodel.teacher.classes.ClassesUserPageRequestVM;
import com.github.pagehelper.PageHelper;
import com.github.pagehelper.PageInfo;
import lombok.AllArgsConstructor;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.Date;
import java.util.List;
import java.util.stream.Collectors;

@Service
@AllArgsConstructor
public class ClassesServiceImpl implements ClassesService {

    private final ClassesMapper classesMapper;
    private final ClassesUserMapper classesUserMapper;

    @Override
    public Classes selectById(Integer id) {
        return classesMapper.selectByPrimaryKey(id);
    }

    @Override
    public int insertByFilter(Classes record) {
        return classesMapper.insertSelective(record);
    }

    @Override
    public int updateByIdFilter(Classes record) {
        return classesMapper.updateByPrimaryKeySelective(record);
    }

    @Override
    public PageInfo<Classes> page(ClassesPageRequestVM requestVM) {
        return PageHelper.startPage(requestVM.getPageIndex(), requestVM.getPageSize(), "id desc").doSelectPageInfo(() ->
                classesMapper.page(requestVM)
        );
    }

    @Override
    public Classes selectClassesByUid(String uid) {
        return classesMapper.selectClassesByUid(uid);
    }

    @Override
    @Transactional
    public ResultEnum joinClasses(User user, Classes classes) {
        ClassesUser classesUser = classesUserMapper.getClassesUser(user.getId(), classes.getId());
        if (null == classesUser) {
            ClassesUser newClassesUser = new ClassesUser();
            newClassesUser.setClassesId(classes.getId());
            newClassesUser.setUserId(user.getId());
            newClassesUser.setDeleted(false);
            newClassesUser.setCreateTime(new Date());
            newClassesUser.setClassesName(classes.getName());
            classesUserMapper.insertSelective(newClassesUser);
            classesMapper.classesNumAdd(classes.getId());
            return ResultEnum.SUCCESS;
        }
        return ResultEnum.FAIL;
    }

    @Override
    public List<Classes> getClassesByCreate(Integer createId) {
        return classesMapper.getClassesByCreate(createId);
    }

    @Override
    public List<Integer> getClassesIdByCreate(Integer createId) {
        List<Classes> classes = getClassesByCreate(createId);
        return classes.stream().map(c -> c.getId()).collect(Collectors.toList());
    }

    @Override
    public Classes getClasses(Integer userId, String name) {
        return classesMapper.getClasses(userId, name);
    }

    @Override
    public PageInfo<ClassesUserInfo> classesUserPageList(ClassesUserPageRequestVM requestVM) {
        return PageHelper.startPage(requestVM.getPageIndex(), requestVM.getPageSize(), "id desc").doSelectPageInfo(() ->
                classesUserMapper.classesUserPageList(requestVM)
        );
    }

    @Override
    public List<ClassesUser> getJoinClasses(Integer uid) {
        return classesUserMapper.getJoinClasses(uid);
    }

    @Override
    public List<KeyValue> getClassCount(List<Integer> classIds) {
        return classesUserMapper.getClassCount(classIds);
    }

    @Override
    @Transactional
    public void removeOutUser(Integer id) {
        ClassesUser classesUser = classesUserMapper.selectByPrimaryKey(id);
        classesUser.setDeleted(true);
        classesUserMapper.updateByPrimaryKeySelective(classesUser);
        classesMapper.classesNumSub(classesUser.getClassesId());
    }

}